I installed a pressure regulator on the interior main supply line of my home to reduce the high pressures at some of the fixtures. Regulator workes fine, however when my in-ground sprinkler turns on, I get a quick pressure drop on the load side of the regulator and the regulator bangs. Pressure comes back up quickly and all is well until the sprinkler switches to the next zone.

The sprinkler is connected on the outside to the the main line on the load side of the water meter.